Acceleration is about a change in velocity, not just speed.
* Speed is how fast something is moving.
* Velocity is speed *and* direction.
Slowing down means your velocity is changing. Even though you're getting slower, your direction might be staying the same (like a car braking on a straight road). This change in velocity means you're experiencing deceleration, which is a type of acceleration.
Think of it like this:
* Acceleration: "Stepping on the gas" to go faster OR changing direction (turning).
* Deceleration (negative acceleration): "Stepping on the brakes" to slow down.
Example:
Imagine a car driving in a straight line. If it hits the brakes, it's slowing down, but its direction isn't changing. This is still acceleration, but in the opposite direction of its motion.
In conclusion: An object can be accelerating even if it's slowing down because acceleration is about changes in velocity, which includes both speed and direction.